Show active tracking reference tooltip

src/app/update/mod.rs

@@ -255,6 +255,7 @@ impl OpenCADStudio {
         {
             self.snapper.clear_tracking();
             self.otrack_active = None;
+            self.otrack_kind = None;
         }
         if let Some(started) = perf_started {
             let elapsed_ms = started.elapsed().as_secs_f64() * 1000.0;
@@ -280,6 +281,7 @@ impl OpenCADStudio {
     pub(in crate::app) fn reset_tracking_after_point(&mut self) {
         self.snapper.clear_tracking();
         self.otrack_active = None;
+        self.otrack_kind = None;
     }
 
     fn update_inner(&mut self, msg: Message) -> Task<Message> {

src/app/update/viewport.rs

@@ -1083,6 +1083,7 @@ impl OpenCADStudio {
             };
 
             self.otrack_active = otrack_hit.map(|hit| (hit.base, hit.dir));
+            self.otrack_kind = otrack_hit.map(|hit| hit.kind);
 
             let mut snapped = if let Some(hit) = otrack_hit {
                 hit.aligned
@@ -1519,6 +1520,7 @@ impl OpenCADStudio {
                 }
             };
             self.otrack_active = otrack_hit.map(|h| (h.base, h.dir));
+            self.otrack_kind = otrack_hit.map(|h| h.kind);
 
             // Parallel snap: with nothing else snapped or tracked, lock
             // the point onto the line through last_point parallel to the